I would like to create a file with every combination of letters out to 10 characters.

For example, the first few lines

a
b
c

then eventually

aa
ab
ac

then eventually

aaa
aab
aac

and so on. Finally, it will end with

zzzzzzzzzz


This will create 26^10 lines. Is there a simple way to create a file like this with some kind of loop?

Thanks in advance.